Journal Article

Non-Gaussian gravitational clustering field statistics

Francisco-Shu Kitaura

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 4, pages 2737-2755
Published in print March 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2011.19680.x
Non-Gaussian gravitational clustering field statistics

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In this work we investigate the multivariate statistical description of the matter distribution in the non-linear regime. We introduce the multivariate Edgeworth expansion of the lognormal distribution to model the cosmological matter field. Such a technique could be useful to generate and reconstruct three-dimensional non-linear cosmological density fields with the information of higher order correlation functions. We explicitly calculate the expansion up to third order in perturbation theory making use of the multivariate Hermite polynomials up to sixth order. The probability distribution function for the matter field includes at this level the two-point, the three-point and the four-point correlation functions. We use the hierarchical model to formulate the higher order correlation functions based on combinations of the two-point correlation function. This permits us to find compact expressions for the skewness and kurtosis terms of the expanded lognormal field which can be efficiently computed. The method is, however, flexible to incorporate arbitrary higher order correlation functions which have analytical expressions. The applications of such a technique can be especially useful to perform weak-lensing or neutral hydrogen 21-cm line tomography, as well as to directly use the galaxy distribution or the Lyman α forest to study structure formation.

Keywords: galaxies: clusters: general; galaxies: statistics; large-scale structure of Universe

Journal Article.  9148 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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